Heel portion of a ski binding



FIG. 1 is a first perspective view of a heel portion of a ski binding showing our new design.

FIG. 2 is a front elevational view thereof.

FIG. 3 is a rear elevational view thereof.

FIG. 4 is a right side elevational view thereof. The left side elevational view is a mirror image of the right side elevational view; and,

FIG. 5 is a top plan view thereof.

The broken lines in the drawings are for environmental purposes only and form no part of the claimed design. 

The ornamental design for a heel portion of a ski binding, as shown and described. 